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Process for producing conjugated diene polymer, conjugated diene polymer, and rubber composition

a technology of conjugated diene and polymer, which is applied in the field of conjugated diene polymer, conjugated diene polymer, and rubber composition, can solve the problems of difficulty in producing a polymer with a sufficiently narrow molecular weight distribution and a sufficiently high cis-1,4-bond content, and achieves simple and inexpensive production of conjugated diene. high cis-bond content and high cis-bond conten

Active Publication Date: 2012-04-10
ENEOS MATERIALS CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0009]The present invention has been completed in view of these problems in the conventional technology and has an object of providing a process for producing a conjugated diene polymer which can simply and inexpensively produce a conjugated diene polymer with a narrow molecular weight distribution and a high cis-bond content. Another object of the present invention is to provide a conjugated diene polymer with a narrow molecular weight distribution and a high cis-bond content. Still another object of the present invention is to provide a rubber composition having high tensile strength, high tensile elongation, excellent crack-growth resistance, and excellent abrasion resistance.
[0024]According to the process for producing a conjugated diene polymer of the present invention, a conjugated diene polymer with a narrow molecular weight distribution and a high cis-bond content can be produced simply and inexpensively. The conjugated diene polymer of the present invention has a narrow molecular weight distribution and a high cis-bond content.
[0025]Furthermore, the rubber composition of the present invention has high tensile strength, high tensile elongation, excellent crack-growth resistance, and excellent abrasion resistance.

Problems solved by technology

However, it has been still difficult to produce a polymer with a sufficiently narrow molecular weight distribution and a sufficiently high cis-1,4-bond content by using the catalysts disclosed in these Patent Documents.

Method used

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  • Process for producing conjugated diene polymer, conjugated diene polymer, and rubber composition

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example 1

[0082]A 5 L autoclave of which the internal atmosphere was replaced by nitrogen was charged with 2.4 kg of cyclohexane and 300 g of 1,3-butadiene. The autoclave was further charged with a catalyst composition (iodine atom / rare earth element-containing compound (molar ratio)=2.0) obtained by reacting a cyclohexane solution of neodymium versatate (Nd(ver)3) (0.18 mmol), a toluene solution of methyl alumoxane (MAO) (1.8 mmol), hydrogenated diisobutylaluminum (AlBu2H) (5.3 mmol), and a toluene solution of trimethylsilyl iodide (Me3SiI) (0.36 mmol) with 1,3-butadiene in an amount of 5 times the mols of neodymium and aging at 50° C. for 30 minutes, to carry out a polymerization reaction 1,3-butadiene at 30° C. for 2 hours. Then, a methanol solution containing 2,4-di-tert-butyl-p-cresol (1.5 g) was added to terminate the polymerization reaction. The solvent was removed by steam stripping and the residue was dried by a roller at 110° C. to obtain 295 g of polymer. The Mooney viscosity (ML1+...

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Abstract

A process for simply and inexpensively producing a conjugated diene polymer with a narrow molecular weight distribution and a high cis-bond content at a low cost is provided. The process comprises a polymerization step, wherein a conjugated diene polymer having a cis-1,4-bond content of 98.5 mass % or more and a ratio (Mw / Mn) of the weight average molecular weight (Mw) to the number average molecular weight (Mn) measured by gel permeation chromatography of 2.5 or less is obtained by carrying out a polymerization reaction in conjugated diene compounds using a catalyst composition containing a rare earth element-containing compound or a reaction product of the rare earth element-containing compound with a Lewis base, an aluminoxane and / or organoaluminum compound, and an iodine-containing compound.

Description

TECHNICAL FIELD[0001]The present invention relates to a conjugated diene polymer with a narrow molecular weight distribution and a high cis-bond content, a process for producing the same, and a rubber composition using the conjugated diene polymer.BACKGROUND ART[0002]A conjugated diene polymer plays a very important industrial role and is produced by polymerizing a conjugated diene compound (monomer). A number of polymerization catalysts used for the polymerization of a conjugated diene compound have been proposed. Particularly, many polymerization catalysts have been studied and developed in order to produce a conjugated diene polymer with a high cis-1,4-bond content having high performance in thermal and mechanical properties. For example, composite catalysts having, as a major component, a transition metal composition containing a transition metal such as nickel, cobalt, and titanium have been known, and some of these are widely used industrially as a polymerization catalyst for ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C08L9/00C08F4/44
CPCC08F36/04C08K3/0033C08L9/00C08F4/545C08K3/013C08F36/06C08F2/00
Inventor NAKAMURA, TAKAHIROTANI, KOUICHIROUTANAKA, RYOUJISONE, TAKUOTADAKI, TOSHIHIROKURAZUMI, JUNKOMASAKI, KOJIOZAWA, YOICHI
Owner ENEOS MATERIALS CORP
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